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ColumnHelper now preserves information on multiple changes to the same group, hopefully while preserving the faster implementation intended by the original patch. NB changes to TestXSSFSheet: the behaviour of column group collapsing/expanding is now closer to what Excel does than before. git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1706789 13f79535-47bb-0310-9956-ffa450edef68